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@ARTICLE{Behnke:3492,
      author       = {Behnke, K. and Kleist, E. and Uerlings, R. and Wildt, J.
                      and Rennenberg, H. and Schnitzler, J.-P.},
      title        = {{RNA}i-mediated suppression of isoprene biosynthesis in
                      hybrid poplar impacts ozone tolerance},
      journal      = {Tree physiology},
      volume       = {29},
      issn         = {0829-318X},
      address      = {Victoria, BC},
      publisher    = {Heron},
      reportid     = {PreJuSER-3492},
      pages        = {725 - 736},
      year         = {2009},
      note         = {The authors thank Ursula Scheerer for ascorbate and
                      glutathione analyses and Sandrine Louis for helpful comments
                      on the manuscript. This work was supported by the German
                      Science Foundation (DFG) (SCHN653/4 to J.-P.S., RE515/20 to
                      H.R.) within the German joint research group 'Poplar - A
                      Model to Address Tree-Specific Questions'.},
      abstract     = {Isoprene is the most abundant volatile compound emitted by
                      vegetation. It influences air chemistry and is thought to
                      take part in plant defense reactions against abiotic stress
                      such as high temperature or ozone. However, whether or not
                      isoprene emission impacts ozone tolerance of plants is still
                      in discussion. In this study, we exploited the transgenic
                      non-isoprene emitting grey poplar (Populus x canescens
                      (Aiton) Sm.) in a biochemical and physiological model study
                      to investigate the effect of acute ozone stress on the
                      elicitation of defense-related emissions of plant volatiles,
                      on photosynthesis and on the antioxidative system. We
                      recorded that non-isoprene emitting poplars were more
                      resistant to ozone as indicated by less damaged leaf area
                      and higher assimilation rates compared to ozone-exposed
                      wild-type (WT) plants. The integral of green leaf volatile
                      emissions was different between the two poplar phenotypes
                      and was a reliable early marker for subsequent leaf damage.
                      For other stress-induced volatiles, such as mono-, homo- and
                      sesquiterpenes and methyl salicylate, similar time profiles,
                      pattern and emission intensities were observed in both
                      transgenic and WT plants. However, unstressed non-isoprene
                      emitting poplars are characterized by elevated levels of
                      ascorbate and alpha-tocopherol as well as by a more
                      effective de-epoxidation ratio of xanthophylls than the WT.
                      Since ozone quenching properties of ascorbate are much
                      higher than those of isoprene and furthermore
                      alpha-tocopherol is also an essential antioxidant,
                      non-isoprene emitting poplars might benefit from changes
                      within the antioxidative system by providing them with
                      enhanced ozone tolerance.},
      keywords     = {Antioxidants: metabolism / Butadienes / Carbon Dioxide:
                      metabolism / Hemiterpenes: biosynthesis / Hemiterpenes:
                      genetics / Hybridization, Genetic / Models, Biological /
                      Oxidative Stress / Ozone: pharmacology / Pentanes / Plant
                      Leaves: drug effects / Plant Leaves: genetics / Plant
                      Leaves: metabolism / Plant Stomata: metabolism / Plant
                      Transpiration: drug effects / Plants, Genetically Modified:
                      drug effects / Plants, Genetically Modified: metabolism /
                      Populus: drug effects / Populus: genetics / Populus:
                      metabolism / RNA Interference / Antioxidants (NLM Chemicals)
                      / Butadienes (NLM Chemicals) / Hemiterpenes (NLM Chemicals)
                      / Pentanes (NLM Chemicals) / Ozone (NLM Chemicals) / Carbon
                      Dioxide (NLM Chemicals) / isoprene (NLM Chemicals) / J
                      (WoSType)},
      cin          = {ICG-3},
      ddc          = {630},
      cid          = {I:(DE-Juel1)ICG-3-20090406},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Forestry},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:19324699},
      UT           = {WOS:000265850500010},
      doi          = {10.1093/treephys/tpp009},
      url          = {https://juser.fz-juelich.de/record/3492},
}